Carburetor



Aprile, 1930. L. C. WOLFE .1,753,634

CARBURETOR Filed Jn 15 ,y 19.26 .2 Sheets-#sheet 1 gHYCIITCl l w Chrome Patented Apr. 8, 1930 PATENT oP-FICE LOUIS C. WOLFE, OF ALTOONA, PENNSYLVANIA caminamos. g

Application n led Januaryls, 1926. Serial No. 81,069.

This invention relates to internal combus-` tion engines, wherein gasoline, one of the lighter distillates of crude oil is admitted to the cylinder in a finely divided state through the lmedium of a carburetor, the duty of which is to vaporize the gasoline and to mix it in the correct proportions with oxygen in the air in the ratio of about six parts by weight of vapor to 100 parts of air, which mixture gives the most perfect combination.

This mixture when exploded through the medium4 of an electric spark makes a most perfect combustion mixture, and the primary object of this inventionis to provide an improved carburetor wherein. the proper mixture is had at all times regardless of the engine piston speed.

A further object of this invention is to provide improved means for admitting the proper mixture to high -speed six and eight cylinder engines through the medium of a third 'gasoline jet that functions only at the required speed of the piston while air in the correct proportion is mixed with the gasoline as it emerges from the jet. p e

- A still further object of this invention is to provide means for housing the 'et of the third gasoline supply pipe toget er with means for lifting the housing so as to uncover the nozzle while at the same time prof .viding means for spraying the gasoline such as to greatly facilitate its proper mixture wilh the air drawn in through the4 air inta e.

With these and many other objects in view which will be more readily apparent as the nature of the invention is better understood,

the same consists in the novel construction,

combination and arrangement ofparts, as

40 will be hereinafter fully pointed out illustrated and claimed.

It will be quite readily understood by those skilled in the art to whlch this inventlon be-A longs, that the same is susceptible to various changes and modifications without departy improved carburetor, showing the nozzle asing from the s irit or scope of the invention,

. but a preferre and practical embodiment of the invention is shown in the accompanying drawings 1n which- Figure 1 v1s a cross sectional view of my sembly aswell as the hood arrangement emplloyed to house the nozzle of the third nozz e. y

Figure 2 is a plan view of the 'carburetor shown in Figure 1 of the drawings.

Figure 3 shows a sectional view taken on the line 3--3 of Figure 2.

Figure 4 is a; side elevational view of my improved carburetor, showing the means employed for openin ythe needle valve which controls the gasolme outlet from the iioat chamber to the low,medium and high speed nozzles, positioned inthe air passage of the carburetor.

Similar reference numerals refer to slmi- .lar parts throughout the several guresfoyi,l

the drawings.

In the construction of this improved carburetor, designated in-its entirey by the numeral 10, I use the usual gasoline iioat chamber 11, having ositioned therein a ioat 12 attached to a p ate 13, which is loosely pinioned on a fulcrum 14, and adapted to carry at the opposite end lthe usual needle valve 15, which controls the gasoline inlet from the supply sump to the iioat chamber 11. The float chamber is also provided with a vgasoline sump 17, gasoline to this sump begasoline to themedium and high speed nozzles designated by the numerals 21 and 22 respectively. The gasoline supply to the chamber is controlled throughthe float 12, which prohibits the gasoline from rising above the orifice of nozzle 23 as shown in Figure 1 of the drawings.

The low speed nozzle 23, is adapted to be positioned in the air intake passage 24, adjacent the wall 25, where it is shown housed'in a segmental block 26. The block 26 is provided with a Venturi passage '27 through which air is drawn to combine with the gasoline drawnfrom the nozzle 23, the supply to which is controlled through a needlevalve 28 as shown in Figurel of the drawings. To provide a more perfect mixture of gasoline and air for low piston speeds, a plurality of openings 29 are provided in the block 26 as shown in Figure 2 of the drawings.

By reference to Figure 4 of the drawings it will be seen that the gasoline supply to the medium speed nozzle 21 is controlled through a needle valve 18 which permits the passage of gasoline from the float chamber 11 to the sump 17, and the valve is adapted to'ropen rapidly after the piston speed has reached the maximum for low speed work, at which time fuel is drawn through the nozzle 21, striking the wall 30, against which it is sprayed to mingle with the air passing up through the air chamber 24. A flap valve 31 is positioned in the air passage, where it is provided-with a fulcrum 32 on which it is adapted to swing. The valve 31 is further provided with an adjustable dash pot 33 to which it is attached through the medium of a link 34. In the back of the valve 31 I positionga` cylindrical housing 35 which is adapted to cover over and completely house the end 36 of the nozzle 22, this housing 35, is designed to remain over the nozzle end 36 until the engine speed is.

such that the required air volume is suicient to lift the flap valve 31 and thus uncover the nozzle, which at this time discharges a fine stream of gasoline against the face 37 of the flap valve 31, thus in a very effective way,

the gasoline is sprayed permitting the air in the correct proportions to mingle'therewith giving, when most needed, an explosive mix` ture for high piston speeds in six and eight cylinder automobiles. As the piston speeds decline, the flap valve 31 automatically falls and the housing 35 again closes the nozzle 36, and since the elevation of the nozzle is higher than thesupply in float chamber the gasoline supply through the nozzle is automatically shut off. v Relative to the foregoing, it will be noted that the flap valve 31 is provided with a rela` tively small notch 40 which is located a sufficient distance above the nozzle 21 when the free edge portion of the valve falls against the wall 30 of the housing to thereby prevent substantially any suction occurring-in the immediate vicinity of the outlet end of said nozzle during low speeds. Without suction, fuel will not be drawn from the nozzle 21 and consequently at low speeds only' the nozzle 23 is effective to admit fuel into the passage 24. At medium speeds, which result in increased suction through the passage 24, with consequent elevation of the free edge portion of the flap valve 31, the outlet end of the nozzle 21 is exposed to suction and fuel is drawn from said nozzle into the passage 24. Y The nozzle 21 thus is a medium speed nozzle, not only for the reasons just stated but because its outlet end is disposed considerably above the outlet end-of the nozzle 23, greater suction being required under such conditions to draw fuel from said nozzle 21 than from the nozzle 23 as is manifest.

Having thus described my invention what I claim and desire to be secured by Letters Patent islao l. A multiple jet carburetor having a main air passage, a segment shaped insert arranged in said air passage and having a Venturi opening, afloat chamber, a sump chamber below the float chamber, a manually operated needle valve controlling communication between the ioat chamber and thev sump, a low hinged adjacent said'segment shaped insert,`

said valve having a free edge portion normally lying against the wall towards which said medium speed nozzle is directed, said valve further carrying a housing for normally covering the high speed nozzle and being notched toV normally uncover the mediumsped nozzle, vand cushioning means for said va ve.

2. A. carburetor including a mixing cham-` ber, an air inlet to said chamber, a low speedl gasoline jet exposed to j the Vaction i of the draft through the chamber, a second jet in said chamber terminating substantial-l ly above said flrst jet, a third jet in said chamber terminating below said second jet,

'and means for shielding saidf second and third jets from the action of the draft through the chamber, said means being movable and so disposed with relation to said second and thirdjets that, upon movement;

it successively exposes said second and third jets to the action of the draft.

lasy

3. Acarburetor including a mixing chamber, an air inlet to said chamber, a low speed gasoline jet exposed to the action of the draft I through the chamber, a second jet in said chamber terminating substantially above the action of the draft through the chamber,'

4. nature.

said first jet, a third jet said chamber terminating below said second jet, and means for shielding said second and third jets from said means yieldingly urged to the shielding position and subject to the action of the draft v .ond andV third jets to the action of the draft as the said draft increases.

In testimony LOUIS C. WOLF.,

`whereof he aixes his sig-4 

